Panasonic SL-CT720 Portable CD / MP3 Player with D.Sound Technology Personal CD player with anti-skip protection and wired remote control Supports CD, CD-R/RW, and MP3 formats; 6 equalizer presets for varied sound D.sound technology reduces distortion, boosts the bass, and restores lost MP3 fidelity Plays up to 140 hours (MP3) or 80 hours (CD) on 2 NiMH and 2 AA batteries Includes external battery case and headphones; 5.38 x 0.62 x 5.38 inches (W x H x D)